(...)What is the Persian equivalent of a minister of telecommunications, please? I.e. which minister is in charge of the telephone system?(...)

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The best equivalent for "minister of telecommunication" is وزير ارتباطات, but because there are some other duties for a "minister of telecommunication" in I.R.IRAN, we are calling him as وزير ارتباطات و فن‌آوري.